🚧 remove new keyword to get inline with dart 2 code standard.

stateless_widgets/lib/main.dart

@@ -1,10 +1,10 @@
 import 'package:flutter/material.dart';
 
 void main() {
-  runApp(new MaterialApp(
-    home: new MyApp(),
+  runApp(MaterialApp(
+    home: MyApp(),
     // Define the theme, set the primary swatch
-    theme: new ThemeData(primarySwatch: Colors.green),
+    theme: ThemeData(primarySwatch: Colors.green),
   ));
 }
 
@@ -15,53 +15,53 @@ class MyApp extends StatelessWidget {
     final double myTextSize = 30.0;
     final double myIconSize = 40.0;
     final TextStyle myTextStyle =
-        new TextStyle(color: Colors.grey, fontSize: myTextSize);
+        TextStyle(color: Colors.grey, fontSize: myTextSize);
 
-    var column = new Column(
+    var column = Column(
       // Makes the cards stretch in horizontal axis
       crossAxisAlignment: CrossAxisAlignment.stretch,
       children: <Widget>[
         // Setup the card
-        new MyCard(
+        MyCard(
             // Setup the text
-            title: new Text(
+            title: Text(
               "Favorite",
               style: myTextStyle,
             ),
             // Setup the icon
             icon:
-                new Icon(Icons.favorite, size: myIconSize, color: Colors.red)),
-        new MyCard(
-            title: new Text(
+                Icon(Icons.favorite, size: myIconSize, color: Colors.red)),
+        MyCard(
+            title: Text(
               "Alarm",
               style: myTextStyle,
             ),
-            icon: new Icon(Icons.alarm, size: myIconSize, color: Colors.blue)),
-        new MyCard(
-            title: new Text(
+            icon: Icon(Icons.alarm, size: myIconSize, color: Colors.blue)),
+        MyCard(
+            title: Text(
               "Airport Shuttle",
               style: myTextStyle,
             ),
-            icon: new Icon(Icons.airport_shuttle,
+            icon: Icon(Icons.airport_shuttle,
                 size: myIconSize, color: Colors.amber)),
-        new MyCard(
-            title: new Text(
+        MyCard(
+            title: Text(
               "Done",
               style: myTextStyle,
             ),
-            icon: new Icon(Icons.done, size: myIconSize, color: Colors.green)),
+            icon: Icon(Icons.done, size: myIconSize, color: Colors.green)),
       ],
     );
 
-    return new Scaffold(
-      appBar: new AppBar(
-        title: new Text("Stateless Widget"),
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("Stateless Widget"),
       ),
-      body: new Container(
+      body: Container(
         // Sets the padding in the main container
         padding: const EdgeInsets.only(bottom: 2.0),
-        child: new Center(
-          child: new SingleChildScrollView(child: column),
+        child: Center(
+          child: SingleChildScrollView(child: column),
         ),
       ),
     );
@@ -74,17 +74,17 @@ class MyCard extends StatelessWidget {
   final Widget icon;
   final Widget title;
 
-  // Constructor. {} here denote that they are optional values i.e you can use as: new MyCard()
+  // Constructor. {} here denote that they are optional values i.e you can use as: MyCard()
   MyCard({this.title, this.icon});
 
   @override
   Widget build(BuildContext context) {
-    return new Container(
+    return Container(
       padding: const EdgeInsets.only(bottom: 1.0),
-      child: new Card(
-        child: new Container(
+      child: Card(
+        child: Container(
           padding: const EdgeInsets.all(20.0),
-          child: new Column(
+          child: Column(
             children: <Widget>[this.title, this.icon],
           ),
         ),

stateless_widgets/test/widget_test.dart

@@ -12,7 +12,7 @@ import '../lib/main.dart';
 void main() {
   testWidgets('Counter increments smoke test', (WidgetTester tester) async {
     // Build our app and trigger a frame.
-    await tester.pumpWidget(new MyApp());
+    await tester.pumpWidget(MyApp());
 
     // Verify that our counter starts at 0.
     expect(find.text('0'), findsOneWidget);